Nikon's latest Prostaff Target EFR is designed and engineered for .22 LR, air rifle, and other applications where the versatility of focusing at extended ranges-both close and distant-is desired. Fully multicoated optical system provides up to 98% light transmission and maximum brightness from dawn to dusk. Generous, consistent eye relief keeps your brow safe, even with heavy recoiling cartridges, lightweight rifles, and severe shooting angles. Precise, 1/4-MOA hand-turn adjustments get you zeroed in quicker and maintain your setting, even with heavy recoil. Zero-Reset turrets make field adjustments as simple as dialing-in your subsequent ranges. Quick-focus eyepiece allows you to instantly bring the reticle into sharp focus. Nitrogen filled and O-ring sealed for 100% waterproof and fog proof use.